الفهرس 
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Abstract
One-hundred and twenty random samples of Clupea harengus (C. harengus), Mugil cephalus (M. cephalus), Sardinella aurita (S. aurita), Oreochromis niloticus (O. niloticus), Neptunus pelagicus (N. pelagicus) and Sepia savigngi (S. savigngi) (n=20 each) were collected from local markets in Mansoura city, Egypt. Those samples were checked to see whether any residues of organochlorine pesticides (OCPs) with the application of risk assessment due to their consumption by Mansoura citizens, Egypt.
The incidences of α HCH were 95%, 100%, 70%, 100% and 65% with mean values of 3.21±1.81, 1.33±0.74, 4.13±1.91, 0.75±0.53 and 0.27±0.13 µg.kg-1 of wet weight in examined C. harengus, M. cephalus, S. aurita, T. nilotica and S. savigngi, respectively. The β-HCH incidences were 50%,70%,70%and 100% and mean values were 4.02±3.07, 12.65±14.65, 0.51± 0.08 and 0.09±0.01 µg.kg-1 of wet weight in examined C. harengus, S. aurita, T. nilotica and N. pelagicus, respectively. The γ-HCH have incidences 100% ,85%,50%and 25% and mean values 7.82±4.11, 44.84±35.47, 0.53±0.16, and 0.67± 0.4901 µg.kg-1 of wet weight in examined C. harengus, S. aurita, T. nilotica and S. Savigngi, respectively. The δ-HCH recorded incidences 60%, 50%,70%, and 50% and mean values 7.82±4.11, 44.84±35.47, 0.53±0.16,and 0.67±0.49 µg.kg-1 of wet weight in examined C. harengus, T. nilotica , N. pelagicus and S. Savigngi, respectively. The concentrations of ∑HCH arranged in descending manner of the examined seafood samples were S. aurita (61.61±52.03 µg.kg 1) > C. harengus (19.7±11.64 µg.kg-1) > O. niloticus (2.32±0.83 µg.kg-1) > M. cephlaus (1.33±0.74 µg.kg-1) > S. savigngi (1.43±0.70 µg.kg-1) >N. pelagicus (0.27±0.13 µg.kg-1).